Merge branch 'master' of github.com:igniterealtime/Smack

This makes the code shorter as there is now a single place where the
socket should be closed.

.travis.yml

@@ -18,7 +18,7 @@ cache:
     - $HOME/.m2
 
 before_install:
-  - export GRADLE_VERSION=5.5.1
+  - export GRADLE_VERSION=6.2
   - wget https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-all.zip
   - unzip -q gradle-${GRADLE_VERSION}-all.zip
   - export PATH="$(pwd)/gradle-${GRADLE_VERSION}/bin:$PATH"

build.gradle

@@ -13,7 +13,7 @@ buildscript {
 
 plugins {
     id 'ru.vyarus.animalsniffer' version '1.5.0'
-	id 'net.ltgt.errorprone' version '0.8.1'
+	id 'net.ltgt.errorprone' version '1.1.1'
 }
 
 apply plugin: 'org.kordamp.gradle.markdown'
@@ -129,7 +129,7 @@ allprojects {
 			':smack-omemo-signal',
 			':smack-openpgp',
 		].collect { project(it) }
-		junitVersion = '5.4.2'
+		junitVersion = '5.6.0'
 		powerMockVersion = '2.0.2'
 		commonsIoVersion = '2.6'
 	}
@@ -680,7 +680,7 @@ def getAndroidRuntimeJar() {
 	if (androidJar.isFile()) {
 		return androidJar
 	} else {
-		throw new Exception("Can't find android.jar for $androidApiLevel API. Please install corresponding SDK platform package")
+		throw new Exception("Can't find android.jar for API level ${androidApiLevel}. Please install corresponding SDK platform package")
 	}
 }
 

smack-core/src/main/java/org/jivesoftware/smack/proxy/ProxySocketConnection.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2015-2016 Florian Schmaus.
+ * Copyright 2015-2019 Florian Schmaus.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,16 @@ import java.net.Socket;
 
 public interface ProxySocketConnection {
 
+    /**
+     * Initiate a connection to the given host on the given port. Note that the caller is responsible for closing the
+     * socket in case this method throws.
+     *
+     * @param socket the socket to use to initiate the connection to the proxy.
+     * @param host the host to connect to.
+     * @param port the port to connect to.
+     * @param timeout the timeout in milliseconds.
+     * @throws IOException in case an I/O error occurs.
+     */
     void connect(Socket socket, String host, int port, int timeout)
                     throws IOException;
 

smack-core/src/main/java/org/jivesoftware/smack/proxy/Socks4ProxySocketConnection.java

@@ -16,6 +16,8 @@
  */
 package org.jivesoftware.smack.proxy;
 
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -24,6 +26,8 @@ import java.net.InetSocketAddress;
 import java.net.Socket;
 import java.nio.charset.StandardCharsets;
 
+import org.jivesoftware.smack.util.OutputStreamUtil;
+
 /**
  * Socket factory for socks4 proxy.
  *
@@ -39,20 +43,17 @@ public class Socks4ProxySocketConnection implements ProxySocketConnection {
     @Override
     public void connect(Socket socket, String host, int port, int timeout)
                     throws IOException {
-        InputStream in = null;
-        OutputStream out = null;
         String proxy_host = proxy.getProxyAddress();
         int proxy_port = proxy.getProxyPort();
         String user = proxy.getProxyUsername();
 
-        try {
         socket.connect(new InetSocketAddress(proxy_host, proxy_port), timeout);
-            in = socket.getInputStream();
-            out = socket.getOutputStream();
-            socket.setTcpNoDelay(true);
+        InputStream in = socket.getInputStream();
+        DataInputStream dis = new DataInputStream(in);
+        OutputStream out = socket.getOutputStream();
 
-            byte[] buf = new byte[1024];
-            int index = 0;
+        ByteArrayOutputStream outBuf = new ByteArrayOutputStream();
+        byte[] inBuf;
 
     /*
     1) CONNECT
@@ -72,25 +73,22 @@ public class Socks4ProxySocketConnection implements ProxySocketConnection {
     of all zero bits.
     */
 
-            buf[index++] = 4;
-            buf[index++] = 1;
+        outBuf.write(4);
+        outBuf.write(1);
 
-            buf[index++] = (byte) (port >>> 8);
-            buf[index++] = (byte) (port & 0xff);
+        outBuf.write(port >>> 8);
+        outBuf.write(port & 0xff);
 
         InetAddress inetAddress = InetAddress.getByName(proxy_host);
         byte[] byteAddress = inetAddress.getAddress();
-            for (int i = 0; i < byteAddress.length; i++) {
-                buf[index++] = byteAddress[i];
-            }
+        outBuf.write(byteAddress);
 
         if (user != null) {
             byte[] userBytes = user.getBytes(StandardCharsets.UTF_8);
-                System.arraycopy(userBytes, 0, buf, index, user.length());
-                index += user.length();
+            outBuf.write(userBytes);
         }
-            buf[index++] = 0;
-            out.write(buf, 0, index);
+        outBuf.write(0);
+        OutputStreamUtil.writeResetAndFlush(outBuf, out);
 
     /*
     The SOCKS server checks to see whether such a request should be granted
@@ -119,43 +117,17 @@ public class Socks4ProxySocketConnection implements ProxySocketConnection {
     The remaining fields are ignored.
     */
 
-            int len = 6;
-            int s = 0;
-            while (s < len) {
-                int i = in.read(buf, s, len - s);
-                if (i <= 0) {
+        inBuf = new byte[6];
+        dis.readFully(inBuf);
+        if (inBuf[0] != 0) {
             throw new ProxyException(ProxyInfo.ProxyType.SOCKS4,
-                        "stream is closed");
+                "server returns VN " + inBuf[0]);
         }
-                s += i;
-            }
-            if (buf[0] != 0) {
-                throw new ProxyException(ProxyInfo.ProxyType.SOCKS4,
-                    "server returns VN " + buf[0]);
-            }
-            if (buf[1] != 90) {
-                try {
-                    socket.close();
-                }
-                catch (Exception eee) {
-                }
-                String message = "ProxySOCKS4: server returns CD " + buf[1];
+        if (inBuf[1] != 90) {
+            String message = "ProxySOCKS4: server returns CD " + inBuf[1];
             throw new ProxyException(ProxyInfo.ProxyType.SOCKS4, message);
         }
-            byte[] temp = new byte[2];
-            in.read(temp, 0, 2);
-        }
-        catch (RuntimeException e) {
-            throw e;
-        }
-        catch (Exception e) {
-            try {
-               socket.close();
-            }
-            catch (Exception eee) {
-            }
-            throw new ProxyException(ProxyInfo.ProxyType.SOCKS4, e.toString());
+        inBuf = new byte[2];
+        dis.readFully(inBuf);
     }
 }
-
-}

smack-core/src/main/java/org/jivesoftware/smack/proxy/Socks5ProxySocketConnection.java

@@ -16,15 +16,16 @@
  */
 package org.jivesoftware.smack.proxy;
 
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.InetSocketAddress;
 import java.net.Socket;
 import java.nio.charset.StandardCharsets;
-import java.util.logging.Logger;
 
-import org.jivesoftware.smack.util.CloseableUtil;
+import org.jivesoftware.smack.util.OutputStreamUtil;
 
 /**
  * Socket factory for Socks5 proxy.
@@ -32,7 +33,6 @@ import org.jivesoftware.smack.util.CloseableUtil;
  * @author Atul Aggarwal
  */
 public class Socks5ProxySocketConnection implements ProxySocketConnection {
-    private static final Logger LOGGER = Logger.getLogger(Socks5ProxySocketConnection.class.getName());
 
     private final ProxyInfo proxy;
 
@@ -43,22 +43,18 @@ public class Socks5ProxySocketConnection implements ProxySocketConnection {
     @Override
     public void connect(Socket socket, String host, int port, int timeout)
                     throws IOException {
-        InputStream in = null;
-        OutputStream out = null;
         String proxy_host = proxy.getProxyAddress();
         int proxy_port = proxy.getProxyPort();
         String user = proxy.getProxyUsername();
         String passwd = proxy.getProxyPassword();
 
-        try {
         socket.connect(new InetSocketAddress(proxy_host, proxy_port), timeout);
-            in = socket.getInputStream();
-            out = socket.getOutputStream();
+        InputStream in = socket.getInputStream();
+        DataInputStream dis = new DataInputStream(in);
+        OutputStream out = socket.getOutputStream();
 
-            socket.setTcpNoDelay(true);
-
-            byte[] buf = new byte[1024];
-            int index = 0;
+        ByteArrayOutputStream outBuf = new ByteArrayOutputStream();
+        byte[] inBuf;
 
 /*
                    +----+----------+----------+
@@ -81,13 +77,13 @@ public class Socks5ProxySocketConnection implements ProxySocketConnection {
           o  X'FF' NO ACCEPTABLE METHODS
 */
 
-            buf[index++] = 5;
+        outBuf.write(5);
 
-            buf[index++] = 2;
-            buf[index++] = 0;           // NO AUTHENTICATION REQUIRED
-            buf[index++] = 2;           // USERNAME/PASSWORD
+        outBuf.write(2);
+        outBuf.write(0);           // NO AUTHENTICATION REQUIRED
+        outBuf.write(2);           // USERNAME/PASSWORD
 
-            out.write(buf, 0, index);
+        OutputStreamUtil.writeResetAndFlush(outBuf, out);
 
 /*
     The server selects from one of the methods given in METHODS, and
@@ -99,10 +95,11 @@ public class Socks5ProxySocketConnection implements ProxySocketConnection {
                          | 1  |   1    |
                          +----+--------+
 */
-            fill(in, buf, 2);
+        inBuf = new byte[2];
+        dis.readFully(inBuf);
 
         boolean check = false;
-            switch (buf[1] & 0xff) {
+        switch (inBuf[1] & 0xff) {
             case 0:                // NO AUTHENTICATION REQUIRED
                 check = true;
                 break;
@@ -130,20 +127,16 @@ public class Socks5ProxySocketConnection implements ProxySocketConnection {
    PASSWD field that follows. The PASSWD field contains the password
    association with the given UNAME.
 */
-                    index = 0;
-                    buf[index++] = 1;
-                    buf[index++] = (byte) user.length();
+                outBuf.write(1);
                 byte[] userBytes = user.getBytes(StandardCharsets.UTF_8);
-                    System.arraycopy(userBytes, 0, buf, index,
-                        user.length());
-                    index += user.length();
-                    byte[] passwordBytes = passwd.getBytes(StandardCharsets.UTF_8);
-                    buf[index++] = (byte) passwordBytes.length;
-                    System.arraycopy(passwordBytes, 0, buf, index,
-                        passwd.length());
-                    index += passwd.length();
+                OutputStreamUtil.writeByteSafe(outBuf, userBytes.length, "Username to long");
+                outBuf.write(userBytes);
 
-                    out.write(buf, 0, index);
+                byte[] passwordBytes = passwd.getBytes(StandardCharsets.UTF_8);
+                OutputStreamUtil.writeByteSafe(outBuf, passwordBytes.length, "Password to long");
+                outBuf.write(passwordBytes);
+
+                OutputStreamUtil.writeResetAndFlush(outBuf, out);
 
 /*
    The server verifies the supplied UNAME and PASSWD, and sends the
@@ -159,8 +152,9 @@ public class Socks5ProxySocketConnection implements ProxySocketConnection {
    `failure' (STATUS value other than X'00') status, it MUST close the
    connection.
 */
-                    fill(in, buf, 2);
-                    if (buf[1] == 0) {
+                inBuf = new byte[2];
+                dis.readFully(inBuf);
+                if (inBuf[1] == 0) {
                     check = true;
                 }
                 break;
@@ -168,7 +162,6 @@ public class Socks5ProxySocketConnection implements ProxySocketConnection {
         }
 
         if (!check) {
-                CloseableUtil.maybeClose(socket, LOGGER);
             throw new ProxyException(ProxyInfo.ProxyType.SOCKS5,
                 "fail in SOCKS5 proxy");
         }
@@ -199,21 +192,19 @@ public class Socks5ProxySocketConnection implements ProxySocketConnection {
          order
 */
 
-            index = 0;
-            buf[index++] = 5;
-            buf[index++] = 1;       // CONNECT
-            buf[index++] = 0;
+        outBuf.write(5);
+        outBuf.write(1);       // CONNECT
+        outBuf.write(0);
 
         byte[] hostb = host.getBytes(StandardCharsets.UTF_8);
         int len = hostb.length;
-            buf[index++] = 3;      // DOMAINNAME
-            buf[index++] = (byte) len;
-            System.arraycopy(hostb, 0, buf, index, len);
-            index += len;
-            buf[index++] = (byte) (port >>> 8);
-            buf[index++] = (byte) (port & 0xff);
+        outBuf.write(3);      // DOMAINNAME
+        OutputStreamUtil.writeByteSafe(outBuf, len, "Hostname too long");
+        outBuf.write(hostb);
+        outBuf.write(port >>> 8);
+        outBuf.write(port & 0xff);
 
-            out.write(buf, 0, index);
+        OutputStreamUtil.writeResetAndFlush(outBuf, out);
 
 /*
    The SOCKS request information is sent by the client as soon as it has
@@ -250,49 +241,33 @@ public class Socks5ProxySocketConnection implements ProxySocketConnection {
     o  BND.PORT       server bound port in network octet order
 */
 
-            fill(in, buf, 4);
+        inBuf = new byte[4];
+        dis.readFully(inBuf);
 
-            if (buf[1] != 0) {
-                CloseableUtil.maybeClose(socket, LOGGER);
+        if (inBuf[1] != 0) {
             throw new ProxyException(ProxyInfo.ProxyType.SOCKS5,
-                    "server returns " + buf[1]);
+                "server returns " + inBuf[1]);
         }
 
-            switch (buf[3] & 0xff) {
+        final int addressBytes;
+        // TODO: Use Byte.toUnsignedInt() once Smack's minimum Android SDK level is 26 or higher.
+        final int atyp = inBuf[3] & 0xff;
+        switch (atyp) {
             case 1:
-                    fill(in, buf, 6);
+                addressBytes = 4;
                 break;
             case 3:
-                    fill(in, buf, 1);
-                    fill(in, buf, (buf[0] & 0xff) + 2);
+                byte domainnameLengthByte = dis.readByte();
+                // TODO: Use Byte.toUnsignedInt() once Smack's minimum Android SDK level is 26 or higher.
+                addressBytes = domainnameLengthByte & 0xff;
                 break;
             case 4:
-                    fill(in, buf, 18);
+                addressBytes = 16;
                 break;
             default:
+                throw new IOException("Unknown ATYP value: " + atyp);
+        }
+        inBuf = new byte[addressBytes + 2];
+        dis.readFully(inBuf);
     }
 }
-        catch (RuntimeException e) {
-            throw e;
-        }
-        catch (Exception e) {
-            CloseableUtil.maybeClose(socket, LOGGER);
-            // TODO convert to IOException(e) when minimum Android API level is 9 or higher
-            throw new IOException(e.getLocalizedMessage());
-        }
-    }
-
-    private static void fill(InputStream in, byte[] buf, int len)
-      throws IOException {
-        int s = 0;
-        while (s < len) {
-            int i = in.read(buf, s, len - s);
-            if (i <= 0) {
-                throw new ProxyException(ProxyInfo.ProxyType.SOCKS5, "stream " +
-                    "is closed");
-            }
-            s += i;
-        }
-    }
-
-}

smack-core/src/main/java/org/jivesoftware/smack/util/OutputStreamUtil.java

@@ -0,0 +1,39 @@
+/**
+ *
+ * Copyright 2019 Florian Schmaus
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jivesoftware.smack.util;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+public class OutputStreamUtil {
+
+    public static void writeByteSafe(OutputStream outputStream, int i, String message) throws IOException {
+        if (i < 0 || i > 0xff) {
+            throw new IOException(message + ". The value " + i + " is not within the allowed range for bytes");
+        }
+        outputStream.write(i);
+    }
+
+    public static void writeResetAndFlush(ByteArrayOutputStream byteArrayOutputStream, OutputStream outputStream)
+                    throws IOException {
+        byteArrayOutputStream.writeTo(outputStream);
+        byteArrayOutputStream.reset();
+        outputStream.flush();
+    }
+
+}

smack-core/src/main/java/org/jivesoftware/smack/util/stringencoder/Base32.java

@@ -45,7 +45,7 @@ public class Base32 {
         }
 
     };
-    private static final String ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ2345678";
+    private static final String ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
 
     public static StringEncoder<String> getStringEncoder() {
         return base32Stringencoder;

smack-core/src/test/java/org/jivesoftware/smack/parsing/ParsingExceptionTest.java

@@ -16,8 +16,8 @@
  */
 package org.jivesoftware.smack.parsing;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.jivesoftware.smack.test.util.CharSequenceEquals.equalsCharSequence;
-import static org.junit.Assert.assertThat;
 
 import java.io.IOException;
 

smack-experimental/src/main/java/org/jivesoftware/smackx/mam/MamManager.java

@@ -44,6 +44,7 @@ import org.jivesoftware.smack.util.StringUtils;
 
 import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
 import org.jivesoftware.smackx.forward.packet.Forwarded;
+import org.jivesoftware.smackx.mam.MamManager.MamQueryArgs;
 import org.jivesoftware.smackx.mam.element.MamElements;
 import org.jivesoftware.smackx.mam.element.MamElements.MamResultExtension;
 import org.jivesoftware.smackx.mam.element.MamFinIQ;

smack-extensions/src/test/java/org/jivesoftware/smackx/forward/ForwardedTest.java

@@ -16,10 +16,10 @@
  */
 package org.jivesoftware.smackx.forward;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.jivesoftware.smack.test.util.CharSequenceEquals.equalsCharSequence;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertThat;
 
 import java.util.Properties;
 

smack-extensions/src/test/java/org/jivesoftware/smackx/iqversion/VersionTest.java

@@ -16,9 +16,9 @@
  */
 package org.jivesoftware.smackx.iqversion;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.jivesoftware.smack.test.util.CharSequenceEquals.equalsCharSequence;
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 
 import org.jivesoftware.smack.DummyConnection;

smack-extensions/src/test/java/org/jivesoftware/smackx/ping/PingTest.java

@@ -16,10 +16,10 @@
  */
 package org.jivesoftware.smackx.ping;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.jivesoftware.smack.test.util.CharSequenceEquals.equalsCharSequence;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 import static org.jxmpp.jid.JidTestUtil.DUMMY_AT_EXAMPLE_ORG;

smack-extensions/src/test/java/org/jivesoftware/smackx/pubsub/provider/PubSubProviderTest.java

@@ -16,9 +16,9 @@
  */
 package org.jivesoftware.smackx.pubsub.provider;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.jivesoftware.smack.test.util.CharSequenceEquals.equalsCharSequence;
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertThat;
 
 import java.util.List;
 

smack-extensions/src/test/java/org/jivesoftware/smackx/receipts/DeliveryReceiptTest.java

@@ -16,11 +16,11 @@
  */
 package org.jivesoftware.smackx.receipts;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.jivesoftware.smack.test.util.CharSequenceEquals.equalsCharSequence;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
 
 import java.util.Properties;

smack-extensions/src/test/java/org/jivesoftware/smackx/xhtmlim/provider/XHTMLExtensionProviderTest.java

@@ -17,8 +17,8 @@
 package org.jivesoftware.smackx.xhtmlim.provider;
 
 import static org.hamcrest.CoreMatchers.instanceOf;
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.jivesoftware.smack.test.util.CharSequenceEquals.equalsCharSequence;
-import static org.junit.Assert.assertThat;
 
 import java.io.IOException;
 import java.io.InputStream;

smack-integration-test/src/test/java/org/igniterealtime/smack/inttest/unittest/SmackIntegrationTestFrameworkUnitTest.java

@@ -1,6 +1,6 @@
 /**
  *
- * Copyright 2015-2019 Florian Schmaus
+ * Copyright 2015-2020 Florian Schmaus
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,6 +19,7 @@ package org.igniterealtime.smack.inttest.unittest;
 import static org.igniterealtime.smack.inttest.SmackIntegrationTestUnitTestUtil.getFrameworkForUnitTest;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertThrows;
 import static org.junit.Assert.assertTrue;
 
 import java.io.IOException;
@@ -43,15 +44,10 @@ import org.igniterealtime.smack.inttest.SmackIntegrationTestFramework;
 import org.igniterealtime.smack.inttest.SmackIntegrationTestFramework.TestRunResult;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
-import org.junit.Rule;
 import org.junit.Test;
-import org.junit.rules.ExpectedException;
 
 public class SmackIntegrationTestFrameworkUnitTest {
 
-    @Rule
-    public ExpectedException expectedException = ExpectedException.none();
-
     private static boolean beforeClassInvoked;
     private static boolean afterClassInvoked;
 
@@ -68,10 +64,10 @@ public class SmackIntegrationTestFrameworkUnitTest {
     @Test
     public void throwsRuntimeExceptionsTest() throws KeyManagementException, NoSuchAlgorithmException, SmackException,
                     IOException, XMPPException, InterruptedException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
-        expectedException.expect(RuntimeException.class);
-        expectedException.expectMessage(ThrowsRuntimeExceptionDummyTest.RUNTIME_EXCEPTION_MESSAGE);
         DummySmackIntegrationTestFramework sinttest = getFrameworkForUnitTest(ThrowsRuntimeExceptionDummyTest.class);
+        assertThrows(RuntimeException.class, () -> {
             sinttest.run();
+        });
     }
 
     public static class ThrowsRuntimeExceptionDummyTest extends AbstractSmackIntegrationTest {

smack-omemo/src/main/java/org/jivesoftware/smackx/omemo/util/OmemoMessageBuilder.java

@@ -274,13 +274,13 @@ public class OmemoMessageBuilder<T_IdKeyPair, T_IdKey, T_PreKey, T_SigPreKey, T_
     }
 
     /**
-     * Generate a 16 byte initialization vector for AES encryption.
+     * Generate a 12 byte initialization vector for AES encryption.
      *
-     * @return iv TODO javadoc me please
+     * @return iv initialization vector
      */
     public static byte[] generateIv() {
         SecureRandom random = new SecureRandom();
-        byte[] iv = new byte[16];
+        byte[] iv = new byte[12];
         random.nextBytes(iv);
         return iv;
     }

smack-tcp/src/main/java/org/jivesoftware/smack/tcp/XMPPTCPConnection.java

@@ -606,6 +606,7 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
                 try {
                     proxyInfo.getProxySocketConnection().connect(socket, host, port, timeout);
                 } catch (IOException e) {
+                    CloseableUtil.maybeClose(socket, LOGGER);
                     hostAddress.setException(e);
                     failedAddresses.add(hostAddress);
                     continue;